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1 5/8" / 40mm air knob with distinctive crossbar. Threads onto 1 5/8" /
42mm flange (click on picture to see flange). The original air knob is no
longer available, but can be replaced by the ones shown below, for a
like-new aesthetic appearance. If airflow "cutoff" functionality is
required, you will need the rubber adapter gasket washer shown below (it
works well, but have to be glued under the air knob).
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